CN108695511B - Lithium ion battery material surface coating conductive layer and preparation method thereof - Google Patents
Lithium ion battery material surface coating conductive layer and preparation method thereof Download PDFInfo
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- CN108695511B CN108695511B CN201710242970.6A CN201710242970A CN108695511B CN 108695511 B CN108695511 B CN 108695511B CN 201710242970 A CN201710242970 A CN 201710242970A CN 108695511 B CN108695511 B CN 108695511B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The preparation method comprises the following steps of coating a conducting layer on the surface of a lithium ion battery material, uniformly coating the conducting layer on the surface of material particles in a friction mode, and coating the conducting layer on the surface of the lithium ion battery material, wherein firstly, natural crystalline flake graphite with the purity of more than 99.99 percent, high-purity artificial graphite or various carbon conducting agents are manufactured into a plate-shaped structure, and secondly, the manufactured plate-shaped structure is arranged on a plane mill; thirdly, adding the lithium ion battery material particles through a feeding port of a plane mill; and fourthly, adjusting the gap between the upper grinding sheet and the lower grinding sheet of the plane grinder, the pressure of the upper grinding sheet and the lower grinding sheet and the rotating speed of the upper grinding sheet until the thickness of the conducting layer coated on the surface of the lithium ion battery material particles reaches the required thickness, and the invention has the advantages that: the compaction density of the battery pole piece is improved, the volumetric specific energy density and the mass specific energy density of the single battery are improved, the purpose of rapid charging and discharging is achieved, and the problems of uneven mixing and core expansion caused by adding a conductive agent in the prior art are solved.
Description
Technical Field
The invention relates to the technical field of lithium ion battery materials, in particular to a conducting layer coated on the surface of a lithium ion battery material and a preparation method thereof.
Background
With the rapid development of electric vehicles and battery energy storage, lithium ion batteries as a core technology have also become a research hotspot. The lithium ion battery is a new green secondary battery, and has been widely used in various portable electronic products due to its advantages of high voltage, high capacity, small volume, light weight, long cycle life, good safety performance, no memory effect, etc., and will become the main power source of electric vehicles and hybrid electric vehicles, and is considered to be the secondary battery with the most competitive power and the most development potential, while the decisive factors of the performance of the lithium ion secondary battery are the positive electrode material, and the important properties of the battery, such as the working voltage (the extraction-insertion voltage of lithium ions in the positive electrode material), the working time (the energy storage density and the charge-discharge cycle property of the positive electrode material), the stability (the structural stability of the positive electrode material under various working conditions), etc., are all determined by the positive electrode material. The lithium ion battery anode material not only participates in electrochemical reaction as an electrode material, but also is a lithium ion source, so the key for developing a high-performance lithium ion secondary battery is to obtain the high-performance anode material.
Disclosure of Invention
The invention provides a lithium ion battery material surface-coated conductive layer and a preparation method thereof, which improve the compaction density of a battery pole piece, thereby improving the volumetric specific energy density and the mass specific energy density of a single battery, achieving the purpose of rapid charge and discharge, and solving the problems of uneven mixing and core expansion caused by adding a conductive agent (such as carbon black, acetylene black and the like) in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
the surface of the lithium ion battery material is coated with a conducting layer, and the lithium ion battery material is characterized in that: the method comprises the following steps: the conductive layer is uniformly coated on the surface of material particles in a friction mode, the material particles are mainly at least one of nickel cobalt lithium manganate particles, nickel cobalt lithium aluminate particles, lithium manganate particles, lithium cobaltate particles, lithium iron phosphate particles, lithium iron manganese phosphate particles, lithium nickel cobalt particles, lithium nickel manganese particles and negative electrode material lithium titanate, the conductive layer is natural crystalline flake graphite, high-purity artificial graphite or various carbon conductive agents, and the coating thickness of the conductive layer on the surface of the material particles is 0.5-10 nm.
The preparation method of the conducting layer coated on the surface of the lithium ion battery material is characterized in that: the method comprises the following steps: firstly, preparing natural crystalline flake graphite, high-purity artificial graphite or various carbon conductive agents with the purity of more than 99.99 percent into a plate-shaped structure, wherein the thickness of the plate-shaped structure is 10-400 mm; secondly, mounting the manufactured plate-shaped structure on a plane grinding device; thirdly, adding the lithium ion battery material particles through a feeding port of a plane mill; and fourthly, adjusting the gap between the upper grinding sheet and the lower grinding sheet of the plane grinder, the pressure of the upper grinding sheet and the lower grinding sheet and the rotating speed of the upper grinding sheet until the thickness of the conducting layer coated on the surface of the lithium ion battery material particles reaches the required thickness of 0.5-10 nm.
The invention has the advantages that: the principle that the surface hardness of lithium ion battery material particles is far greater than the surface hardness of natural crystalline flake graphite, high-purity artificial graphite and various carbon conductive agents is utilized, the conductive layer is uniformly covered on the surface of the lithium ion battery material particles in a friction mode without damaging the physical and chemical characteristics of the raw material particles, and the lithium ion battery material particle coating device has the characteristics of simple structure, high manufacturing efficiency, uniform coating and good consistency, solves the problem that the conductive agent needs to be independently added in the manufacturing process of the lithium ion battery, and can solve the problems of uneven mixing and core expansion caused by independently adding the conductive agent, improves the safety performance of the lithium ion battery, reduces the manufacturing cost, and is shown in the following steps: A. the problem of uniform dispersion of lithium ion battery materials; B. the problem of expansion of the electrode after imbibition is solved; C. the usage amount of the electrolyte is reduced; D. the time for manufacturing the positive electrode slurry and the baking time for coating the pole piece are reduced; E. improving the compaction density of the positive and negative pole pieces; F. the mass specific energy density and the volume specific energy density of the battery are improved; G. the rapid charge and discharge characteristics of the battery are improved.
Drawings
FIG. 1 is a schematic structural view of an inventive graphite plate;
FIG. 2 is a schematic view of the flat grinder of the present invention;
FIG. 3 is a schematic view of the upper grinding plate structure of the invention;
FIG. 4 is a schematic structural view of the stainless steel ring of the invention;
FIG. 5 is a schematic view of a lower abrasive sheet according to an embodiment of the present invention;
FIG. 6 is a schematic view of the stainless steel ring structure of the lower grinding plate of the present invention;
FIG. 7 is a schematic view of the structure of the friction between the upper and lower abrasive sheets of particles of the inventive material; (ii) a
In the attached drawings
1. A sheet of conductive material; 2. carrying out plane grinding; 3. grinding the plates; 4. grinding the plate downwards; 5. grinding a stainless steel ring; 6. stainless steel ring of lower grinding sheet, 7, material particles.
Detailed Description
A lithium ion battery material surface cladding conductive layer and its preparation method, as shown in figure 1-7, the said plane mill 2 is by the upper plate 3, lower plate 4, upper plate stainless steel ring 5, lower plate stainless steel ring 6 make up, the said upper plate 3 is cylindrical, there are feed inlets on the said upper plate 3, the upper plate 3 of the said plane mill 2 is fitted with the stainless steel ring 5 of the upper plate, there is annular plane at the bottom of the said upper plate 3, the said annular plane is parallel to lower plate 4, it is conical surfaces between feed inlets and the said annular plane, the invention uses natural crystalline flake graphite, high-purity artificial graphite or various carbon conductive agent to make the conductive material board 1, the thickness of the said conductive material board 1 is 30mm, mount the said conductive material board 1 on upper plate 3 and lower plate 4, adjust the gap and pressure of the upper plate 3 and lower plate 4, and the rotational speed of the upper plate 3, and placing the material particles 8 between the upper grinding plate 3 and the lower grinding plate 4 through a feeding hole, placing the material particles 7 between the upper grinding plate 3 and the lower grinding plate 4, keeping the lower grinding plate 4 in a static state, rotating the upper grinding plate 3 at a constant speed, and finally enabling the carbon conducting layer on the conducting material plate 1 to be uniformly coated on the surfaces of the material particles 7, wherein the coated material particles 7 flow out through a discharging hole in the lower grinding plate 4.
The invention has the beneficial effects that: by utilizing the principle that the surface hardness of the material particles 7 is far greater than that of natural crystalline flake graphite, high-purity artificial graphite and various carbon conductive agents, the conductive layer is uniformly covered on the surface of the material particles 7 in a friction mode without damaging the physical and chemical characteristics of the raw material particles 7, the conductive coating has the characteristics of simple structure, high manufacturing efficiency, uniform coating and good consistency, the problem that the conductive agent needs to be independently added in the manufacturing process of the lithium ion battery is solved, and the problems of uneven mixing and core expansion caused by independently adding the conductive agent can be solved. A. The problem of uniform dispersion of the material; B. the problem of expansion of the electrode after imbibition is solved; C. the usage amount of the electrolyte is reduced; D. the time for manufacturing the slurry and the baking time for coating the pole piece are reduced; E. the compaction density of the pole piece is improved; F. the mass specific energy density and the volume specific energy density of the battery are improved; G. the rapid charge and discharge characteristics of the battery are improved.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (1)
1. The preparation method of the conducting layer coated on the surface of the lithium ion battery material comprises the following steps: uniformly coating a conducting layer on the surface of material particles in a friction mode, wherein the material particles mainly comprise at least one of nickel cobalt lithium manganate particles, nickel cobalt lithium aluminate particles, lithium manganate particles, lithium cobaltate particles, lithium iron phosphate particles, lithium iron manganese phosphate particles, lithium nickel cobalt particles, lithium nickel manganese particles and negative electrode material lithium titanate, the conducting layer is natural crystalline flake graphite, high-purity artificial graphite or various carbon conductive agents, and the thickness of the conducting layer coated on the surface of the material particles is 0.5-10 nm; the preparation method of the conducting layer coated on the surface of the lithium ion battery material is characterized by comprising the following steps of: the method comprises the following steps: firstly, preparing natural crystalline flake graphite, high-purity artificial graphite or various carbon conductive agents with the purity of more than 99.99 percent into a plate-shaped structure, wherein the thickness of the plate-shaped structure is 10-400 mm; secondly, mounting the manufactured conductive material plate-shaped structure on a plane grinding device; thirdly, adding the material particles through a feeding port of a plane grinding device; and fourthly, adjusting the gap between the upper grinding sheet and the lower grinding sheet of the plane grinder, the pressure of the upper grinding sheet and the lower grinding sheet and the rotating speed of the upper grinding sheet until the thickness of the conducting layer coated on the surface of the lithium ion battery material particles reaches the required thickness of 0.5-10 nm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710242970.6A CN108695511B (en) | 2017-04-07 | 2017-04-07 | Lithium ion battery material surface coating conductive layer and preparation method thereof |
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| CN201710242970.6A CN108695511B (en) | 2017-04-07 | 2017-04-07 | Lithium ion battery material surface coating conductive layer and preparation method thereof |
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| CN108695511A CN108695511A (en) | 2018-10-23 |
| CN108695511B true CN108695511B (en) | 2021-04-02 |
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| CN103872287A (en) * | 2014-03-20 | 2014-06-18 | 重庆工商大学 | Composite positive electrode material of graphene and lithium iron phosphate battery and preparation method thereof |
| CN103956488A (en) * | 2014-04-17 | 2014-07-30 | 四会市达博文实业有限公司 | Method for covering lithium iron phosphate conducting layer by use of radio frequency plasma enhanced chemical vapor deposition |
| CN204049283U (en) * | 2014-08-13 | 2014-12-31 | 李永诗 | A kind of stone mill Steam Heating soya-bean milk equipment |
| CN104466163A (en) * | 2014-11-28 | 2015-03-25 | 武汉理工大学 | Preparation method of carbon-coating lithium ion battery positive material |
| CN104934608A (en) * | 2015-04-13 | 2015-09-23 | 青岛科技大学 | Preparation method of in-situ graphene coated lithium ion battery cathode material |
| CN105655589A (en) * | 2014-11-13 | 2016-06-08 | 安泰科技股份有限公司 | Graphene composite material and preparation method thereof |
| CN106058158A (en) * | 2016-07-21 | 2016-10-26 | 青岛海达新能源材料有限公司 | Full-automatic continuous production equipment for anode material of lithium ion battery and method |
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2017
- 2017-04-07 CN CN201710242970.6A patent/CN108695511B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2923024Y (en) * | 2006-05-19 | 2007-07-18 | 比亚迪股份有限公司 | Covering ball mill |
| CN103872287A (en) * | 2014-03-20 | 2014-06-18 | 重庆工商大学 | Composite positive electrode material of graphene and lithium iron phosphate battery and preparation method thereof |
| CN103956488A (en) * | 2014-04-17 | 2014-07-30 | 四会市达博文实业有限公司 | Method for covering lithium iron phosphate conducting layer by use of radio frequency plasma enhanced chemical vapor deposition |
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| CN105655589A (en) * | 2014-11-13 | 2016-06-08 | 安泰科技股份有限公司 | Graphene composite material and preparation method thereof |
| CN104466163A (en) * | 2014-11-28 | 2015-03-25 | 武汉理工大学 | Preparation method of carbon-coating lithium ion battery positive material |
| CN104934608A (en) * | 2015-04-13 | 2015-09-23 | 青岛科技大学 | Preparation method of in-situ graphene coated lithium ion battery cathode material |
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